{-# LANGUAGE ScopedTypeVariables #-}

-- This file is part of the Wire Server implementation.
--
-- Copyright (C) 2022 Wire Swiss GmbH <opensource@wire.com>
--
-- This program is free software: you can redistribute it and/or modify it under
-- the terms of the GNU Affero General Public License as published by the Free
-- Software Foundation, either version 3 of the License, or (at your option) any
-- later version.
--
-- This program is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-- FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
-- details.
--
-- You should have received a copy of the GNU Affero General Public License along
-- with this program. If not, see <https://www.gnu.org/licenses/>.

module Bilge.Retry where

import Bilge.RPC (RPCException (..))
import Control.Monad.Catch
import Imports
import Network.HTTP.Client (HttpException (..), HttpExceptionContent (..), responseStatus)
import Network.HTTP.Types

httpHandlers :: (Monad m) => [a -> Handler m Bool]
httpHandlers = [const . Handler $ pure . canRetry]

rpcHandlers :: (Monad m) => [a -> Handler m Bool]
rpcHandlers =
  [ const . Handler $ \(RPCException _ _ cause) ->
      pure $ maybe False canRetry (fromException cause)
  ]

canRetry :: HttpException -> Bool
canRetry (HttpExceptionRequest _ ResponseTimeout) = True
canRetry (HttpExceptionRequest _ ConnectionClosed) = True
canRetry (HttpExceptionRequest _ ConnectionFailure {}) = True
canRetry (HttpExceptionRequest _ InternalException {}) = True
canRetry (HttpExceptionRequest _ ProxyConnectException {}) = True
canRetry (HttpExceptionRequest _ (StatusCodeException rs _)) = statusIsServerError (responseStatus rs)
canRetry _ = False
